The Latest Gluten-Free Option: Acorn Flour?

Ever eaten an acorn? Probably not, but more and more people are giving it a try.

While known perhaps most widely as sustenance for squirrels, backyard foragers, and Native American tribes, acorns — and more specifically acorn flour — are gaining some ground again in the United States.

The bad part is that if you want to harvest them from your back yard, you'll have your work cut out for you in order to make them edible. Acorns are filled with tannins that are incredibly astringent. It takes a couple rounds of soaking in order to get them to be edible. But if you're dying to try acorns, there are a couple of companies that sell acorn flour.